;;; rot13.el --- display a buffer in rot13.;; Copyright (C) 1988 Free Software Foundation, Inc.;; Author: Howard Gayle:;; Maintainer: FSF;; This file is part of GNU Emacs.;; GNU Emacs is free software; you can redistribute it and/or modify;; it under the terms of the GNU General Public License as published by;; the Free Software Foundation; either version 2, or (at your option);; any later version.;; GNU Emacs is distributed in the hope that it will be useful,;; but WITHOUT ANY WARRANTY; without even the implied warranty of;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the;; GNU General Public License for more details.;; You should have received a copy of the GNU General Public License;; along with GNU Emacs; see the file COPYING. If not, write to the;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,;; Boston, MA 02111-1307, USA.;;; Commentary:;; The single entry point, `rot13-other-window', performs a Caesar cipher;; encrypt/decrypt on the current buffer and displays the result in another ;; window. Rot13 encryption is sometimes used on USENET as a read-at-your-;; own-risk wrapper for material some might consider offensive, such as;; ethnic humor.;;;; Written by Howard Gayle.;; This hack is mainly to show off the char table stuff.;;; Code:(defvarrot13-display-table(let((i-1)(a(char-to-int?a))(A(char-to-int?A))(table(make-display-table)))(while(<(incfi)26)(asettable(+ia)(char-to-string(int-to-char(+(%(+i13)26)a))))(asettable(+iA)(char-to-string(int-to-char(+(%(+i13)26)A)))))table)"Char table for rot 13 display.");;;###autoload(defunrot13-other-window()"Display current buffer in rot 13 in another window.To terminate the rot13 display, delete that window."(interactive)(let((w(display-buffer(current-buffer)t)))(set-specifiercurrent-display-tablerot13-display-tablew)));;;###autoload(defuntoggle-rot13-mode()"Toggle the use of rot 13 encoding for the current window."(interactive)(let((w(selected-window)))(if(equal(specifier-specscurrent-display-tablew)rot13-display-table)(set-specifiercurrent-display-tablenilw)(set-specifiercurrent-display-tablerot13-display-tablew))))(provide'rot13);;; rot13.el ends here